【摘要】：隨著人們安全防范意識(shí)的加強(qiáng),各種安全檢查設(shè)備被廣泛應(yīng)用,安檢技術(shù)得到了飛速發(fā)展,其中背散射、雙視角等新興技術(shù)也在X射線行李安檢設(shè)備中得到重視和應(yīng)用。本文主要研究雙視角行李安檢設(shè)備的數(shù)據(jù)采集電路,包含硬件電路設(shè)計(jì)以及主控單元FPGA的數(shù)字邏輯設(shè)計(jì)。在介紹了X射線透射成像基本原理的基礎(chǔ)上,簡單介紹了常用行李安檢設(shè)備的構(gòu)成及工作機(jī)理,并引出雙視角行李安檢設(shè)備的結(jié)構(gòu)、工作流程、數(shù)據(jù)采集電路等內(nèi)容。數(shù)據(jù)采集電路硬件設(shè)計(jì)可分為探測板電路設(shè)計(jì)和采集傳輸板電路設(shè)計(jì)。探測板電路設(shè)計(jì)中,分別介紹了三種探測板設(shè)計(jì)方案,通過比較其優(yōu)缺點(diǎn),并綜合考慮各種因素,選擇并實(shí)現(xiàn)了分立元器件探測板方案。采集傳輸板設(shè)計(jì)中,主要功能模塊有信號(hào)調(diào)理、模數(shù)轉(zhuǎn)換、數(shù)據(jù)傳輸、板載存儲(chǔ)等。信號(hào)調(diào)理電路使用數(shù)字電位計(jì)實(shí)現(xiàn)程控增益,模數(shù)轉(zhuǎn)換選用更高精度、更多通道的芯片,數(shù)據(jù)傳輸模塊以UDP網(wǎng)絡(luò)傳輸?shù)姆绞脚c計(jì)算機(jī)通信,并設(shè)置板載存儲(chǔ)芯片保存工作參數(shù)。數(shù)字邏輯設(shè)計(jì)中,詳述了探測板陣列模塊、數(shù)字電位計(jì)控制模塊、模數(shù)轉(zhuǎn)換控制模塊、數(shù)據(jù)傳輸模塊等,并簡單介紹了數(shù)據(jù)組織和數(shù)據(jù)傳輸協(xié)議。經(jīng)過測試與分析,所設(shè)計(jì)的數(shù)據(jù)采集電路數(shù)據(jù)通道增益滿足設(shè)計(jì)指標(biāo),數(shù)據(jù)傳輸速率大于24Mbps且傳輸穩(wěn)定,采集的信號(hào)質(zhì)量良好。數(shù)據(jù)采集電路設(shè)計(jì)滿足雙視角行李安檢設(shè)備需求。
[Abstract]:With the strengthening of people's security awareness, a variety of safety inspection equipment has been widely used, security technology has been rapid development, including backscattering, dual-angle and other emerging technologies in X-ray baggage security equipment has been attached importance and application. This paper mainly studies the data acquisition circuit of double view baggage security equipment, including the hardware circuit design and the digital logic design of the main control unit FPGA. Based on the introduction of the basic principle of X-ray transmission imaging, this paper briefly introduces the structure and working mechanism of the commonly used baggage security equipment, and introduces the structure, workflow and data acquisition circuit of the dual-angle baggage security inspection equipment. Data acquisition circuit hardware design can be divided into detection board circuit design and acquisition transmission board circuit design. In the circuit design of the detection board, three kinds of design schemes of the detection board are introduced respectively. By comparing their advantages and disadvantages and considering various factors, the discrete component detection board scheme is selected and realized. In the design of the collection and transmission board, the main function modules are signal conditioning, A / D conversion, data transmission, board load storage and so on. The signal conditioning circuit uses digital potentiometer to realize program-controlled gain, A / D conversion uses the chip with higher precision and more channels, the data transmission module communicates with the computer by UDP network transmission mode, and sets the on-board memory chip to save the working parameters. In the design of digital logic, the module of detector array, the control module of digital potentiometer, the control module of analog-to-digital conversion and the module of data transmission are described in detail, and the data organization and data transmission protocol are briefly introduced. After testing and analysis, the data channel gain of the designed data acquisition circuit meets the design index, the data transmission rate is larger than 24Mbps, the data transmission is stable, and the signal quality is good. The design of data acquisition circuit meets the requirement of double-angle baggage inspection equipment.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TP274;TN402

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